C++：类和访问权限

解题思路:

注意事项:

参考代码:

#include<iostream>

using namespace std ;

class sum

{

         private :

                 int a ;

                 int b ;

         public :

             int s()

             {

                     if (cin >> a >> b)

                     {

                             cout << a + b << endl ;

                             return 1 ;

                     } 

                     else 

                     {

                             return -1;

                     }

             }

};

int main ( )

{

         class sum sp ;

         while ( sp.s() != -1 ) ;

         return  0 ;

}